Telephone-exchange system.



E. E. CLEMENT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED AUGJS. 19H.

3 SHEETS-SHEET I- Patented Oct. 10, 1916.

E. E. CLEMENT. TELEPHONE EXCHANGE SYSTEM. APPLICATION riugn Aue.15, 1911.

1,200,81 1. Patented 0111 10,1916.

3 SHEETS-SHEET 2.

Patented Oct. 10, 1916.

3 SHEETS-SHEET 3- will]...

E'DVIABID E. CLEMENT IKESNE .ASSIGIfi fZl-ENTS,

scribers stuimpulses from the ca.

tion, or from en operatofis "posit on, to; he switches for ihe pilj of actuating ilie latter. In either case, in a. system of any considerable size, the'individunl subscriber s or operators impulse sender becomes associated at different times with many difierent switches, and While ihc rate transmission impulses from the sender remains the same, tie variation in iine resis' no and in the time constams oil difl' rent rows as Well as the switches themsel" Working to a ce'r't'ain (BZZiQHlZ r the object of the present invention to eliminate the uncertainty resuling i this marginal condition, so that irres of conditions, all swihches will Work Well in connection with any sender. l eitzin this object by providing switch wi'ch means to make and break its own actuating circuit, as a result of ias actuation. and l co the, senders so they will respcnn no the impulses thus produced in the actuation of any switch, and'will actmerely as means for 1 limiting ahe extent of the actuation, iustezm.

of causing the some. The present invention is in the nature oi? an improvement over the inventions described in cerlzain prior applications, as follows: Serial No. 306,292. filed March 15, 1906; Serial No. 323,096, filed June-23, 1906; Serial No. 327,096. filed July E20, 1906; Serial No. 345,167; filed November 2%.; 1906; Serial No. 408,039, filed December 26, 190'? and Serial No. 28,885. filed April 1008.-

The invemion is illustnted in ihc accompanying; drawings in which I Figure 1 isa diagram showing a simple form of sender, m; a subscribefs'station, and the suhscribers line terminating at z; swiihch 'lhzouggi which other lines may reached.

IQR,

STRICT GE EQLUEJZBML, ASSIEGI Eerie; E0. G l-207$.

2 diagram Of u :lour (lie i; sender with central oilice connections u. ifilllll" line leading; to a select-or SWl CCl s i in diagram showing; the first seleclzor switch sol l. l is lhe line extending from the suhscrihefs station 9. to a celcml oliice or another station 3. and prov ed. at 3 -ish a poinc'sx .cctive vhtch adapted to here its Wiper ernis Ti SilQpPi-Ki aroiuid over ihe contacts 6 through the agency r ratchet i" secured. on the shaft of the Wiper arm, andactuated by pawl carried on the end oil the armature lever an eleciromagnet i). ihLillllgSflf magncat lire included in a Branch circuit 10 conch a pair of normally closed contacts 11 adapted to he opened each time the iii-nurture oi the nnwnet fully zictmctcd. Thus the nppli canon battery to the line 1 will produce .ifl'li'illicl-Glll) energizeiion of the magnet 9 and correspondingly intermittent actuation of the ratchet '7 to drive iicrwiu'd the Wiper arm At the subscriber station 2 the telephon 12 normally as usual at the switch 13., and a wire taken of? through the sender 153 to but- Pry and ground. The sender consists escollie represents any single conducor.

essor nicgnsjor controlling" and restoring it at i e conclusion of a conversation. in opeineion the subscriber at in order in select a Wanted correspondent as for example uk 25, and Whose number is l, puils down the arm until it registers with numeral 4:. 3y so doihg the io oh 1 w E Z 15 '11, 10, 9, ground and B. Magnet 9 is energized and attracts ts armature,

carried away from the spring 18 which closes upon spring 19and completes the 01 lowingcircuit: B, 2 1-, H, 18, 19, 14, 1, 10,

steps the ratchet forwardone step, carrying the wiper 5 onto the first contact, and then opensthe contact 11. ,Magnet 24- is simultaneously energized and permits the spring 21 to turn the disk 16 and the ratchet backward onehalf step. The breaking of the circuit atdeenei 1265 both magnets i and 524i, the pawl 8 of ratchet 22 with the arm at tl1- substation are'stepped back another half step. springs 11 being then closed both magnets are again energized, and this operation is repeated "Zour times in all so-tliat the arm 5 restsupon No. 4. contact, when theto'oth 17 at the substatiuinv reaches the spring 18 and finally opens the circuit. The telephone 12' may then be used for conversation.

" Referring now to 2, the substation 25 is shown equipped with a standard com Inon'battery telephone set, from which the line wires 26*27 extend to the central of uce and terminate on contacts of a'cut-ofi' relay 28 through which nectcd to a line relay 29 and-battery on one side and ground on the other. The arrange n ent .shown is the so-callcd two wire multiple, with extensions 30 and 31 to the jack '32., iwith which cooperates a plug having see and sleeve conductors connected to the-cord conductors :n and 35, terminating at the condensers 36. Tip and sleeve relays type ofcord and jack, the relay 38 controlling battery supply to the cord, and being 40 energized in series with the 'cut-oli relay 28 when the plug is in the jack. The relay 37 controls the circuit of the supervisory lamp 39 and the release circuits l041 tor the automatic switches in Fig. 3, these cir- .cuits being connected to'the trunk conductors 42l3 extending to the first selector The.

they are normally 6011- the former is retracted, and the.

ancer;

rotary relays controltlieir own release circuit and also the back release the sums as in the second selector, but the'lunctions oi the magnet 46 include the test of the line wanted, and the releaseof the switch it that line is busy. The trunk wires 50-51 of the connector terminate at the condensers 4.7 and on the switch side of the condensers the conductors 52 and 53 are extended through contacts of the ringing relay 46 to r the side switch arms -l-6 and 46 #by which thcyare-connected during conversation to the talking wipers .tli and thereby connected to the contacts of thewanted line.

" Fig. 3 to be employed with a two wire mul- 3? and 38 are provided as usual withthis switch l4, which has the usual vertical and rotar" rcla 3 ll and i )rivate ma net 4:4, test relay ll, release magnet 14, talkingwipers 44 test wiper 4e, side switch arms 44:, all, 44 and s l vertical magnet l i and rotary magnet 44-. The second elector switch all) has relays, magnets and contacts corresponding to those of the first le'ctor with the exception that the vertical and rotary relays oi the second selector when simultaneously energized close their own release circuit and also a' branch through the test .bank and "test wiper of a first selector temporarily connected therewith, to thereleaserelay of said first selector The connector switch has vertical and rotary magnets and relays, and atest or private 'norinal magnet, similar in other i'IflllCiLlOllS to those 'of the selectors. The vertical and tiple line circuit as shovtn in Fig. 2, the Strowger circuit is modified by the introduction of condensers 47, the tip and sleeve relays 4-6 and 46 and the ringing relay 46 with its interrupter lG and lockout relay- 46. These parts are substantiallyas shown,

and described in my prior applicationserial No. 428,865, filed April 23, 1908, and also forinno essential part of the present invention.

For the purposcsof the present invention. and in order to enable each of the switches ll, 45 and ll) to generate its own actuating impulses I provide the vertical magnets li and 45" with. interrupter contacts :2? controlled by the magnet armature, these con-- tacts in each case-being normally closed and included in the circuit of the vertical relay 44- or 45. In the case of the connector. the vertical and rotary magnets 46 and T'G are each provided with interrupter contacts :r. bothpairs of which are normally closed and included in series in the circuit of the vertical relay 4:6. The result of? this arrangeincntis that without other change in any switch. when any one o'lthe actuating magnets is properly connected by means of the side switch, it will make and break the circuit oil. its associated controlling relay, which in turn will make and break the magnet circuit, thus producing a reciprocal action which insures not only complete operation of the working magnet for each step, but also sends hack sharp clear line impulses to affect the relays of the sender.

Turning to Fig. .2, the operators sending device is generally designated by the nuice-cell ating magnets and responding to he line impulses in succession. 11inch disk has a retrectile spring, and each scape wheel has :1 portion of its surface smooth, to permit the spring to more the disk back some distance after the working impulses cease. During this extra movement of each dish it carries 11 tooth 101, 102*, etc, past contacts to send a rotary impulse, and into engeg'ement with other contacts which shift the control circuit to the next disk. is the starting relay, which connects the vertfmal and rotary wires 111 and. 115 to the trunk -wires 42 and 4:3. in response to the actuation of the starting key 116. In addition to the contacts of this relay 1 have showne key 116 individual to each trunk, so that the sender 100 may be used with a considerable number of trunks This mode of connection however is intended merely for descriptive purposes and not as limitation.

it may be varied in any of the ways described in my prior applications Serial No. 323,096, filed June. 23, 1906; Serial No. 327,096, filed. July 20, 1906; Serial No. 315,-- 167, filed November 20, 1906; Serial No. 108,039, filed December 26, 1907; and Serial No. 128,865, filed April 23, 1908. it should also be understood that the plug and cord connection between the trunk wires 12-13 tor ascertains the number wanted end the line wires 26-427 may be replaced by any desired primary Selecting means, such as shown 111 any 01' the applications herein named; or the line be connected direct to the trunk conductors, with condensers 3 6 interposed if desired. The sender 100 may also be located at u subscribers station as well as at s central oiiice, the necessary changes to effect this or other modifications referred to being, well within t ie scope of anytelephone engineer or circuit man.

The operation of the apparatus and circuits in 1 igs. 2 and 3 is as followsi The subscriber calls by closing'liis line circuit, relay 29 lights its lamp, plug 33 is inserted in'jack 32, relays 3S28 are energizediu series, relay 37 is energized, and the operain the usual or any desired way. If key 117 is employed, it is'o ctuatecl to cut oil the trunk from the cord, and connect conductors 42-13 tothe contacts of the starting relay 113. The number wanted is then set up by turning the disks 101, 102, 103 and 10- until their respective arms or pointers rest over numerals corresponding so the several digits of the number. The turning of these disks completes the circuits of their respective relays 100, 110, etc, and turns the ratcbets 101, 102 through angular distances corresponding to the several digits. The starting key 116 being depressed, circuit of relay 113 is closed as follows: B, 118, 11!), 110, 220, 112-3, ground, B. The euergiz'ation of relay 113 connects 11-1to 150 and 115 to 151, and the relay locks itself on wire 1 19. Circuit is then completed from the battery to the switch 14 in Fig. as follows: B,

118, 109, 141, 123, 122, (101 being o'li' normal) 111, 150, 12, (into Fig. 3) 14, it, 14, ground, B, Magnet -14 is energized. closing circuit of 1 which is energized and breaks the cont-acts :2: apart at the end of its stroke, but steps the switch spindle and wipers up one step before breaking. The separation of contacts 93 opens the circuit of relay 14, which becomes dei nergized and in turn opens the circuitof magnet 44",

which becomes deiinergized and closes conte'cts :1: thereby closing the former circuit of relay 14:, which again becomes energized, again energizes magnet 44", and so on, the stepping up of the switch 414 and the making and breaking of the circuit at w being repeated so long as the springs Fig. 2 remain closed. These springs are opened when the arm of dish 101 has been returned to zero, which requires as many current impulses as the forward steps through which it was moved in setting. As each current impulse is produced in the actuation of the switch 1 1 one step, it is obvious that the switch has,been set forward or upward a number of steps correspondiug to the digit previously determined The disk 101?v libs ratchet or star teeth. only part way around its circumference, there being ten teeth on each side and smooth spaces intervening. This is for the purpose of permitting lost motion after the number has been received, so thattbe spring sets 220121 and 122-123-421 may be operated in succession. named set produces a rotary impulse for the switch 14 through the following path: B, 118, 14-5, 220, 121, 115, 151, 43, 4-1 44 ground, B. 11" becomes energized and closes the circuit of ll, which becomes energized and'steps the side switch arms all around one step, shifting the trunk wire -12 onto a deed contact and closing circuit of The closure of the first "ypes, the

thereby cemiec hen an idle switch ofseie W81} understood. the trunk Wire L 4-8, whence s. eireuis'; is to :15 as ZfOiiOWSI B, l 114, 150,

$0 13. The operatimi sues in precisely the 521m m selector -14 and ii'iien 1 :eaehes zero position a eibzii'y eve the paiii: B, 118, 1-H I 151 43 43, 45" ground, 1., r 1 then finnis an idle fliifi 4:8 in the meemime remain" he 1e end 134, 132, 129, 12 15Q, is,- $0., :1 :1, 1 to 8. 46 7 actuate-s 1 the switch up 0 1' disk 103 ape/rates inechzinisi'ns die}, lie

irotziiy impuise UK? the next path, 1.55, relay In the eonneeeer :zhe switch has .i :d in response 60 the 1'0 airy impuk 21$ 0:, s0

thatG is, cut out and ie is cut 011 5:0 be cont1'011ed'}.;y impulses fien'i follow this path: 118, 112, i i

11 150 i-EZ, 48 50, be relay 5 him :0 m. i'v'izigneig +26" the? steps 111-1 SW, 7 around to the We; termiim and Hie next rotary impuise mus s mg line fie be tested, and; if'ciem' the side swi fieh mikes its last step, +143 and Q6 connecting the trunk Wires :in fi 53 to line through Wipers 46". Relay :6 connects {he ringing" i'e 21y 530 battery, the interrupter causes its intermittent energizzi'bion, the Wanted subscriber is' rung, any When he answeis the reiny :6 causes the EIRCEgiZiliJiOIi of the .ieekemb rein}; 4:6, and cenversabien proceeds in meantime, the final step of disk 10s :ifeer sending the rotary impulse Wei Wiie opens M4 at 140 139 iikCi else the locking circuit MS MQ of relay 1 whereby the sender i: eniireiy cut from the trunk Wires he ope'zitor may then threw 11?, 01' if this key is replaced inzitic secondary eel-eater o'f fm'th in my pi-ioi' zippliez time 1" will noi; have *he peifm-m any no wait to receive ether ealis. While I imve ciesi? med fliis syseem employing Strowger :1 p511 jacks for (Jenn-seeing e understood that 7 systems of my impulses shouie b and by them i senders instead inereever me/i=1, sei up for entire iiiiiibei's iii advinw n. 'he first actuation of the switching Tax-ions (:Hias sien" I nveniiei What m" a: circuit tars? L {i1 stepping in: for said :5 1.01:, 1"2410/65 eoni'i'eiied imagine: i1. its acii'mti 111 s in said cii s1 .7 reduce imcomplain adapted to be se;

as (ilk/L1H: mm tliei'enfier to Age zidvzii variable distance,

i by the immi send back .i 2. ans. open @113 1 1; the tr'i'nsims minim Pulses iii Hie circu into normal m. Lien.- iine circuit so as sion of impu; reached, nioi'en termiiieil in 2 15 meat of "the iiizzgnet iii/2' said switch inciej device.

2. In euit ex endi iaieaiis ami an to a seiecter switch, netmifiing eleero mm iiti'olhng the M I seine fer ud miieimg; said sw cii by successive steps a circuit RHiZWX'U FvCi Gena-oiled in the (/peinabien of snif. eie ""enmgnefi, and. a sender or ver'abie 121% controller for the switch comprising a cii cuit closing device normally open but adapted Q0 be closed in the initial setting" of ihe sender a movable elemem and an eiecmomngnei adapted to actuate he same seep by step, a connection from sziichimgnei', fihrongh said circuit c10sing device "he die n circuit governed by said circuit intei'i-u whereby said movable elezneni may be caused ice through 'ned numee of steps i'mie said circuit closing; net by 0pen- I movement 0m sfiepping i 11;; to step sic? sending switches to determine the actuation thereof, means for setting said limit device with respect to said switches to enable said actuating means for a predetermined number of steps of said switch, means operable by said limit device in its return to normal movement to send a shifting impulse to the actuating switch.

11. A telephone exchange system, comprisingsubscribers lines, a series of automatic switch links and switches for interconnecting them, actuating means for the switches, a step by stepiimit device opeated through the actuation oft the switches and governing said actuating means of the switches, means for setting said limit device to 'Jredetermine the disablcment of the switches for a predetermined number of steps ot the switches, together with means whereby said limit device is returned to normal disabling position by said switch synchronously with the stepping ot' the same, and means operable by the limit do- I i u e I no after the last step oi the switch to send a shifting impulse to the links.

- .13. In a telephone exchange system, suh-.

scribers lines, a plurality oi automatic twomotion switches and links for interconnecting the same, primary actuating means for the switches, secondary actuating means for the switches, a limit device operable through the actuation of the switches to disable the primary actuating means of the same,

means for setting said limit device to prodetermine the limitol said' primary motion of the switches, means automatically con trolled by said limit device in its operation by the switches to send a shifting impulse over said links to initiate secondary motion of the switches.

14:. In a telephone exchange system, subecribers lines, a series of two-motion automatic switches and links for interconnect- I ing them, a plurality of limit devices, one

for each link located at common point and adapted to be connected in succession. to the links of the series they are built up, primery actuating magnets for the switches, secondary actuating magnets for the switches, operating means for the limit devices controlled through the actuationot the switches by the primary actuating means, and circuit closing means associated with each switch and successively extending the connection of the limit devices to the primary actuating means exclusively of the secondary actuating means: i

In testimony whereof I attix my signature in presence of two witnesses.

nnwann no CLEMENT Witnesses: E. D. TRACY,

.1 Anne H. Mann. 

